The vehicle theft deterrent system (VTD) is incorporated within the Body Control Module (BCM). If the BCM has been replaced, the password must be relearned using approved Techline diagnostic equipment. If the PCM is replaced, the replacement PCM should learn the password within a few seconds after the ignition is turned ON. This is an information code indicating that the PCM is ready to learn the VTD password. Refer to Diagnostic System Check - Theft Deterrent for further information regarding the VTD system in Theft Deterrent.

The PCM remains in theft deterrent password learn mode for more than 2 seconds.

The PCM stores conditions which were present when the DTC set as Failure Records only. This information will not be stored as Freeze Frame Records.

A new replacement PCM will be in a functional state to learn the password from the BCM. If the BCM is replaced, the PCM must be placed in password learning mode to relearn a new password. Once learned, the password becomes permanent information that remains with the vehicle. The loss of PCM battery or ignition voltage will not affect the programmed password information.

Refer to Programming Replacement Lock Cylinder, Body Control Module or Powertrain Control Module for information concerning the password learning procedure.

If the DTC cannot be duplicated and is determined to be intermittent, reviewing the Failure Records can be useful in determining when the DTC was last set. Also refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.